Query Processing and Optimization
Query Processing and Optimization
Query Processing and Optimization
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Index-based Join<br />
• Requires (at least) one index on a join attribute<br />
• A temporary index can be created<br />
Scan<br />
Outer<br />
for each<br />
record of<br />
s, query<br />
in index<br />
index on r<br />
r<br />
s<br />
if joins<br />
Output<br />
spill<br />
when full<br />
Main Memory<br />
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